Received an unexpected authentication failure.

I had a recent upgrade of my MAC machine. I have it upgraded to Snow leopard OS X 10.6. I am trying to connect to the Server admin after the upgrade and receive an error message.

I usually manage most of the machines with the Admin server help, and now I am not able to do the basic connection.

Received an unexpected authentication failure.

This may be caused by trying to connect to a server prior to version 10.5.8 If this is the case, please install the latest update of Mac OS X Server software on ‘server2.local.’ and try to connect again.

Received an unexpected authentication failure.

As per the instructions from the message, go ahead and update your Mac OS X Server so you could use Mac OS X Snow Leopard admin tool. I believe it will work.

But in case it doesn't work, try this one too.

Use a virtual machine for Mac. I would recommend VirtualBox because it is free and it works. Install Mac OS X Tiger (10.4) or Mac OS X Leopard (10.5) in VirtualBox and run Server admin there, while still having Mac OS X Snow Leopard as your main OS. VirtualBox 3.2.0 already has a support for Mac OS X.

Received an unexpected authentication failure.

2- You may need to install several versions of Mac OS X and also server admin tools so you need to have a virtual machine ( VM).

3- You may need to have VCN or ARD or using software for screen sharing so you can directly manage server box of your Mac OS X and also on your target server you have ability to use the admin server tools.

4- You may need to install Snow leopard server.

So you can choose one of these solutions like i said it's up to you so i hope these solutions help you

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